# CLI Deprecation Warning System

## Module
Cli

## Status
VERIFIED

## Description
Deprecation warnings displayed when users invoke old command paths, guiding them to the new consolidated equivalents.

## Implementation Details
- **Route Mapping**: `src/Cli/StellaOps.Cli/cli-routes.json` -- JSON-driven mapping with `type: "deprecated"` entries containing `removeIn` version and migration reason
- **Infrastructure**: `src/Cli/StellaOps.Cli/Infrastructure/` -- deprecation warning middleware that emits warnings to stderr
- **Command Factory**: `src/Cli/StellaOps.Cli/Commands/CommandFactory.cs` -- integrates deprecation checks into command resolution
- **Warning format**: "WARNING: 'stella <old>' is deprecated and will be removed in <version>. Use 'stella <new>' instead. Reason: <reason>"
- **Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/Integration/DeprecationWarningTests.cs`

## E2E Test Plan
- [ ] Run a deprecated command (e.g., `stella notify channels list`) and verify deprecation warning on stderr
- [ ] Verify warning includes the deprecated command path, new path, and removal version
- [ ] Verify the deprecated command still executes successfully (backward-compatible)
- [ ] Verify new command path (e.g., `stella config notify channels list`) shows no warning
- [ ] Verify warnings go to stderr (not stdout) so they don't break JSON output parsing
- [ ] Verify `--quiet` or `--no-warnings` suppresses deprecation warnings
- [ ] Verify all route mappings with `type: "deprecated"` emit warnings

## Verification

- **Verified**: 2026-02-13T15:30:00Z
- **Tier 0 (Source)**: pass -- all referenced source files exist on disk
- **Tier 1 (Build)**: pass -- module builds cleanly, 238 tests pass in StellaOps.Cli.Formatting.Tests
- **Tier 2d (Integration)**: pass -- targeted integration tests confirm behavioral correctness
- **Test Project**: `src/Cli/__Tests/StellaOps.Cli.Formatting.Tests/StellaOps.Cli.Formatting.Tests.csproj`
- **Evidence**: `docs/qa/feature-checks/runs/cli/cli-deprecation-warning-system/run-001/tier2-integration-check.json`